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Phylogeny and generic delimitations in the sister tribes Hymenodictyeae and Naucleeae (Rubiaceae).
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Stockholm University, Faculty of Science, The Bergius Botanical Garden Museum. Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Stockholm University, Faculty of Science, The Bergius Botanical Garden Museum. Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The Hymenodictyeae-Naucleeae clade is a predominantly Paleotropical group with 220 species in 28 genera. The phylogenetic relationships and generic limits within Naucleeae have previously been assessed using combined molecular-morphological data, however the status of some genera remains questionable. The evolutionary relationships within Hymenodictyeae have never been investigated before. We performed phylogenetic analyses of the Hymenodictyeae-Naucleeae clade using nuclear [nrETS; nrITS] and chloroplast [ndhF; rbcL; rps16; trnT-F] data and a large sampling of both tribes. Our study supports the monophyly of the tribes, all subtribes of Naucleeae (Adininae, Breoniinae, Cephalanthinae, Corynantheinae, Mitragyninae, Naucleinae, and Uncariinae), and the Hymenodictyeae genera Hymenodictyon and Paracorynanthe. In Naucleeae, the monotypic genera Adinauclea, Metadina, and Pertusadina are nested within Adina, Mitragyna within Fleroya, Ludekia, Myrmeconauclea, and Ochreinauclea within Neonauclea, and Burttdavya and Sarcocephalus within Nauclea. Corynanthe and Pausinystalia are mutually paraphyletic. We provisionally maintain the current generic status of Neonauclea and its allied genera, pending further study. In sum, we recognize 17 genera in Naucleeae: Adina s.l., Breonadia, Breonia, Cephalanthus, Corynanthe s.l., Diyaminauclea, Gyrostipula, Janotia, Khasiaclunea, Ludekia, Mitragyna s.l., Myrmeconauclea, Nauclea s.l., Neolamarckia, Neonauclea, Ochreinauclea, and Uncaria. Five new combinations were made: Adina euryncha, Adina malaccensis, Corynanthe lane-poolei subsp. iturense, Corynanthe talbotii, and Nauclea nyasica.

National Category
Botany
Research subject
Plant Systematics
Identifiers
URN: urn:nbn:se:su:diva-98620OAI: oai:DiVA.org:su-98620DiVA: diva2:684639
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2014-01-10
In thesis
1. Systematics and Biogeography of Western Indian Ocean Region Rubiaceae: examples from Danaideae, Hymenodictyeae, and Naucleeae
Open this publication in new window or tab >>Systematics and Biogeography of Western Indian Ocean Region Rubiaceae: examples from Danaideae, Hymenodictyeae, and Naucleeae
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on the systematics and biogeography of the tribes Danaideae, Hymenodictyeae, and Naucleeae in the angiosperm family Rubiaceae (coffee family), with a special interest in the Western Indian Ocean region (WIOR). The levels of endemism in the WIOR are remarkably high and Madagascar is the largest island surrounded by three main archipelagos with islands of various age and size. Rubiaceae is one of the species-rich families in the region, rendering it a suitable group for addressing evolutionary and biogeographic questions.

Danaideae consists of the two Malagasy endemic genera Payera and Schismatoclada, and the WIOR-centered Danais. The monophyly and generic delimitations of the tribe were tested with molecular data. The tribe was strongly supported as monophyletic, and resolved in two well-supported clades: the Danais and Payera-Schismatoclada clade. The ancestor of Danaideae was inferred to have dispersed from continental Africa to Madagascar, where the major diversification of the tribe took place in the Late Miocene to Pliocene. Danais colonized the neighbouring archipelagos between 6.54 and 2.98 Mya, and recolonized continental Africa once.

The predominantly Paleotropical sister tribes Hymenodictyeae and Naucleeae belong to the mainly Neotropical subfamily Cinchonoideae. The monophyly of the Hymenodictyeae genera, Hymenodictyon and Paracorynanthe, received strong support. Naucleeae consists of 26 genera divided in seven subtribes. All subtribes were resolved as monophyletic, while seven genera are paraphyletic; as a result, we recognize 17 genera. Both our results and the fossil record support the hypothesis of a boreotropical distribution for the ancestor of the Hymenodictyeae-Naucleeae clade. All dispersal events in the WIOR took place in the Miocene or later. The Malagasy species were the result of separate dispersal events from Africa and Gyrostipula comorensis endemic to the Comoros is the result of a single dispersal event from Madagascar.

Place, publisher, year, edition, pages
Stockholm: Department of Ecology, Environment and Plant Sciences, Stockholm University, 2014. 41 p.
National Category
Botany
Research subject
Plant Systematics
Identifiers
urn:nbn:se:su:diva-98516 (URN)978-91-7447-832-7 (ISBN)
Public defence
2014-02-14, Lecture Hall, Department of Ecology, Environment and Plant Sciences, Lilla Frescativägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense the following papers were unpublished and had a status as follows: Paper 2: Manuscript; Paper 3: Manuscript; Paper 4: Manuscript

Available from: 2014-01-23 Created: 2014-01-07 Last updated: 2014-01-24Bibliographically approved

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